The top seed Daniil Medvedev had a tough day at the office in the Miami Open third round, beating Alexei Popyrin in three tight sets and overcoming cramping in the encounter's closing stages to advance into the next round.
After two days, Medvedev stepped on the court again and scored a more comfortable 6-4, 6-3 victory over Frances Tiafoe for the place in the quarters. The Russian fired 11 aces and dropped 17 points in ten service games, losing serve once and keeping the pressure on the other side.
Medvedev fired 24 winners and 22 unforced errors, while the American couldn't follow that pace, getting broken three times to finish his journey in the fourth round. Daniil forged the victory in the shortest range up to four strokes, doing enough damage with his initial shot and the first groundstroke to sail into the last eight.
Tiafoe fought well in the opening set before experiencing a break at 4-5 when his forehand landed long. They traded breaks in games three and four in set number two, with two more break chances for the American at 3-3. Daniil saved both and closed the game with a backhand down the line winner, which boosted him.
World no. 2 secured a break in game eight with a backhand return winner and sealed the deal with an ace at 5-3.
Daniil Medvedev and Roberto Bautista Agut are through to Miami QF.
Roberto Bautista Agut saved a match point in a 6-3, 4-6, 7-6 triumph over the 2018 champion John Isner in two hours and 18 minutes.
The Spaniard saved five out of six break chances and seized both opportunities on the return to prevail in a tight tie break and remain on the title course. Isner had a slight advantage in the shortest range up to four strokes, and it wasn't enough to carry him home after trailing in the more extended exchanges.
Bautista Agut made a convincing start and broke Isner twice in the opener for 6-3. The American grabbed one break in set number two that carried him towards a decider, where Roberto saved two break points in the third game.
Both players served well in the remaining games to set a tie break, where John had a 6-5 lead. Roberto saved a match point with a forced error and won it 9-7 to enter the last eight. Competing in only the second Masters 1000 event, the 20-year-old Sebastian Korda advanced into the quarters with a 6-3, 4-6, 7-5 win over Diego Schwartzman in two hours and 35 minutes, celebrating the first top-10 victory.
Korda suffered three breaks and stole the rival's serve four times to cross the finish line first, wasting a match point in the decider's tenth game and winning the next two to move over the top.